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@Terry53029 wrote:

@TaxGuyBill are you positive you can switch to standard mileage if auto is fully deprecated. do you have a cite for that. Thanks 

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Yes, I am positive.

Revenue Procedure 2010-54 says a taxpayer can use the Standard Mileage Rate to use operate a vehicle in their business.  By default, that initially says it can be used anytime.

It then lists some "limitations" when it can NOT be used.  Using it after an auto is fully depreciated is not in the list of "limitations".